. >>> i'm candy crowley in washington with a check of the headlines. south korea's government says it believes north korea may fire a missile as early as this week. seoul says while it is taking a military readiness posture, south korea warns if limited war breaks out along the korean peninsula, the north will be inflicted with extensive damage. >>> a state department worker who died in an attack in afghanistan is believed to be the first u.s. diplomat killed since last september in benghazi. the 25-year-old was delivering books to a school saturday when a military convoy she was in was attacked. speaking in turkey today, secretary of state john kerry expressed regret about the death, whom he met two weeks ago during his visit to afghanistan. >> it's a grim reminder to all of us, though we didn't need any reminders, of how important and, also, how risky carrying the future is to people who want to resist. >> ten afghan children, three u.s. service members and a defense department worker were also killed in saturday's attack. >>> those are your top stor